SUBFAMILY ERIOCOCCINAE 139 



SPECIES OF TRIONYMUS 

 .. Body never with more than single pair of cerari, anal cerari. 



b. Anal cerari with their ceraran setae elongate and longer than 

 dorsal setae, never short and conical; antennae of adult female 

 consisting of seven segments; anal cerari with two or three auxil- 

 iary setae; anal ring not strongly chitinized; anal setae slightly 



shorter than anal ring setae. California on Distichlis 



distichlii Ferris. 



bb. Anal cerari with their cereran setae short and conical, usually 

 shorter than body setae. 



c. Anal cerari with numerous tricerores grouped about their 

 ceraran setae, distance between them subequal to or less than 

 length of diameter of calices of ceraran setae. 



d. Setae varying in size from small and slender to quite large 

 and stout, those on each lateral portion of eighth segment 

 subequal in diameter at proximal end to ceraran setae; 

 antennae of adult female consisting of seven segments; anal 

 cerari with two or three ceraran setae and several slender 

 auxiliary setae; anal setae somewhat more slender and 



smaller than anal ring setae. California on Grindelia 



grindeliae Ferris 



dd. Setae not varying in size, all very short and slender, sub- 

 equal, those on lateral portions of eighth segment never sub- 

 equal in diameter at proximal end to ceraran setae, always 

 slender; antennae of adult female consisting of seven seg- 

 ments; anal cerari with two ceraran setae and five to eight 

 auxiliary setae; anal setae slightly shorter than anal ring 



setae. Eastern United States on clover trifolii Forbes, 



cc. Anal cerari with only few tricerores and always distant, dis- 

 tance between them always twice or more than length of diame- 

 ter of calices of ceraran setae. 



d. Anal ring setae scarcely more than one-half length of anal 

 setae; antennae of adult female consisting of seven seg- 

 ments. 



e. Body with dorsum with relatively few cerores and cylin- 

 drical ducts, none of ducts short, broad, and tubular; ab- 

 domen with two caudal segments with many short, slender, 

 curved setae, other segments with few. California on 



Elymus. smithii Es-.ig. 



ee. Body with dorsum with few, scattered, small, slender 

 setae and numerous tricerores and short, broad, tubular 

 ducts with a narrow raised rim; abdomen with two caudal 

 segments not with many curved setae. California on 



Quercus. villosa Ehrh. 



dd. Anal ring setae subequal in length to anal setae; antennae 

 of adult female consisting of eight segments; anal cerari 

 with two ceraran setae and two or three auxiliary setae; 

 dorsal setae few, short, slender, curved; anal ring small and 



